/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::surfaceToCell

Description
    A topoSetSource to select cells based on relation to surface.

    Selects:
    - all cells inside/outside/cut by surface
    - cells with centre nearer than XXX to surface
    - cells with centre nearer than XXX to surface \b and with normal
      at nearest point to centre and cell-corners differing by
      more than YYY (i.e., point of high curvature)

SourceFiles
    surfaceToCell.C

\*---------------------------------------------------------------------------*/

#ifndef surfaceToCell_H
#define surfaceToCell_H

#include "topoSetSource.H"
#include "Map.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
class triSurfaceSearch;
class triSurface;

/*---------------------------------------------------------------------------*\
                           Class surfaceToCell Declaration
\*---------------------------------------------------------------------------*/

class surfaceToCell
:
    public topoSetSource
{

    // Private data

        //- Add usage string
        static addToUsageTable usage_;

        //- Name of surface file
        fileName surfName_;

        //- Points which are outside
        pointField outsidePoints_;

        //- Include cut cells
        bool includeCut_;

        //- Include inside cells
        bool includeInside_;

        //- Include outside cells
        bool includeOutside_;

        //- if > 0 : include cells with distance from cellCentre to surface
        //  less than nearDist.
        scalar nearDist_;

        //- if > -1 : include cells with normals at nearest surface points
        //  varying more than curvature_.
        scalar curvature_;

        //- triSurface to search on. On pointer since can be external.
        const triSurface* surfPtr_;

        //- search engine on surface.
        const triSurfaceSearch* querySurfPtr_;

        //- whether I allocated above surface ptrs or whether they are
        //  external.
        bool IOwnPtrs_;


    // Private Member Functions

        //- Find index of nearest triangle to point. Returns triangle or -1 if
        //  not found within search span.
        //  Cache result under pointI.
        static label getNearest
        (
            const triSurfaceSearch& querySurf,
            const label pointI,
            const point& pt,
            const vector& searchSpan,
            Map<label>& cache
        );

        //- Return true if surface normal of nearest points to vertices on
        //  cell differ from that on cell centre. Points cached in
        //  pointToNearest.
        bool differingPointNormals
        (
            const triSurfaceSearch& querySurf,
            const vector& span,
            const label cellI,
            const label cellTriI,
            Map<label>& pointToNearest
        ) const;


        //- Depending on surface add to or delete from cellSet.
        void combine(topoSet& set, const bool add) const;

        //- Check values at construction time.
        void checkSettings() const;

        const triSurfaceSearch& querySurf() const
        {
            return *querySurfPtr_;
        }


public:

    //- Runtime type information
    TypeName("surfaceToCell");

    // Constructors

        //- Construct from components
        surfaceToCell
        (
            const polyMesh& mesh,
            const fileName& surfName,
            const pointField& outsidePoints,
            const bool includeCut,
            const bool includeInside,
            const bool includeOutside,
            const scalar nearDist,
            const scalar curvature
        );

        //- Construct from components (supplied surface, surfaceSearch)
        surfaceToCell
        (
            const polyMesh& mesh,
            const fileName& surfName,
            const triSurface& surf,
            const triSurfaceSearch& querySurf,
            const pointField& outsidePoints,
            const bool includeCut,
            const bool includeInside,
            const bool includeOutside,
            const scalar nearDist,
            const scalar curvature
        );

        //- Construct from dictionary
        surfaceToCell
        (
            const polyMesh& mesh,
            const dictionary& dict
        );

        //- Construct from Istream
        surfaceToCell
        (
            const polyMesh& mesh,
            Istream&
        );


    //- Destructor
    virtual ~surfaceToCell();


    // Member Functions

        virtual sourceType setType() const
        {
            return CELLSETSOURCE;
        }

        virtual void applyToSet
        (
            const topoSetSource::setAction action,
            topoSet&
        ) const;

};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
